Lenovo G550 running Windows 7 won't connect to internet. "Default gateway is not available" message displays. I have 4 Vista computers using wireless connections all functioning fine, but this Windows 7 has stopped working. Has worked without problems for 3 months and then suddenly disconnected from network last night and can't get back on. I have even connected to ethernet cable and still no connection is made. Computer "sees" our network and full signal strength. Network diagram shows connected to our network but a "X" between network and internet, but again, all other computers working fine. I've rebooted modem and wireless router, shut down and rebooted computer and have even system restored to last week and still no internet connection. I have seen a few posts that this is a Microsoft 7 problem, but I can't get any solutions on how to resolve this. Thank you for the help.

So, all of our computers are set to Home network.No firewall to block connections.
Under Network and Sharing Center/View your Active Networks:
On the left: Home Network
On right side: Access Type: No internet access
HomeGroup: Joined
Connections: (5 lite green bars) Wireless Network Connection (home network name)
So, all of our computers are set to Home network.

Can you get the gateway numbers from another machine and manually put them in.Chances are for some reason your router is not puting these into the pcs intenet connection.Or you can request from your internet provider a new ip address.Default gateway not available?
Can you get the gateway numbers from another machine and manually put them in.Chances are for some reason your router is not puting these into the pcs intenet connection.Or you can request from your internet provider a new ip address.

I guess I forgot to add that to my list of "have-tried". I did command prompt ipconfig and wrote down my IPv4 address, Subnet Mask and Default Gateway. I then clicked on my Wireless Connection and then properties, then under Internet Protocol V 4 told it to "use the following" and manually typed in the default gateway- still nothing.

Not sure about ethernet drivers- how would I reinstall if I have no internet access? I really think it's a Microsoft issue since I've seen it in multiple posts, but no one has clear answers about how to get the computer to reconnect.I guess I forgot to add that to my list of "have-tried". I did command prompt ipconfig and wrote down my IPv4 address, Subnet Mask and Default Gateway. I then clicked on my Wireless Connection and then properties, then under Internet Protocol V 4 told it to "use the following" and manually typed in the default gateway- still nothing.
Not sure about ethernet drivers- how would I reinstall if I have no internet access? I really think it's a Microsoft issue since I've seen it in multiple posts, but no one has clear answers about how to get the computer to reconnect.

You could try going to system devices,Ethernet,then uninstall from there.Reboot and let windows 7 reinstall automaticly when it detects new hardware.The drivers should be in the system 32 files all the time.Im shooting in the dark but maybe they became corrupt.One last thing and then im out of answers.How about the routers software itself? Possible update to the router itsself may solve this.You could try going to system devices,Ethernet,then uninstall from there.Reboot and let windows 7 reinstall automaticly when it detects new hardware.The drivers should be in the system 32 files all the time.Im shooting in the dark but maybe they became corrupt.One last thing and then im out of answers.How about the routers software itself? Possible update to the router itsself may solve this.

Exactly the same problem and exactly atthe same date. My laptop installed upodates for windows during night and next day on Mar 11, my wireless and ethernet is not working (working --> but limited connectivity --> no default gateway). Microsoft SUCKS.Exactly the same problem and exactly atthe same date. My laptop installed upodates for windows during night and next day on Mar 11, my wireless and ethernet is not working (working --> but limited connectivity --> no default gateway). Microsoft SUCKS.

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